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1 /* | |
2 * Copyright 2013 Google Inc. | |
3 * | |
4 * Use of this source code is governed by a BSD-style license that can be | |
5 * found in the LICENSE file. | |
6 */ | |
7 | |
8 #include "SkDeviceLooper.h" | |
9 | |
10 SkDeviceLooper::SkDeviceLooper(const SkBitmap& base, | |
11 const SkRasterClip& rc, | |
12 const SkIRect& bounds, bool aa) | |
13 : fBaseBitmap(base) | |
14 , fBaseRC(rc) | |
15 , fDelta(aa ? kAA_Delta : kBW_Delta) | |
16 { | |
17 SkIRect bitmapBounds = SkIRect::MakeWH(base.width(), base.height()); | |
18 if (!fClippedBounds.intersect(bounds, bitmapBounds)) { | |
19 fState = kDone_State; | |
20 } else if (this->fitsInDelta(bounds)) { | |
21 fCurrBitmap = &fBaseBitmap; | |
22 fCurrRC = &fBaseRC; | |
23 fState = kSimple_State; | |
24 } else { | |
25 fCurrBitmap = &fSubsetBitmap; | |
26 fCurrRC = &fSubsetRC; | |
27 // back up by 1 DX, so that next() will put us in a correct starting | |
28 // position. | |
29 fCurrOffset.set(fClippedBounds.left() - fDelta, | |
30 fClippedBounds.top()); | |
31 fState = kComplex_State; | |
32 } | |
33 } | |
34 | |
35 SkDeviceLooper::~SkDeviceLooper() { | |
36 } | |
37 | |
38 void SkDeviceLooper::mapRect(SkRect* dst, const SkRect& src) const { | |
39 SkASSERT(kDone_State != fState); | |
40 *dst = src; | |
41 dst->offset(SkIntToScalar(-fCurrOffset.fX), | |
42 SkIntToScalar(-fCurrOffset.fY)); | |
43 } | |
44 | |
45 void SkDeviceLooper::mapMatrix(SkMatrix* dst, const SkMatrix& src) const { | |
46 SkASSERT(kDone_State != fState); | |
47 *dst = src; | |
48 dst->postTranslate(SkIntToScalar(-fCurrOffset.fX), | |
49 SkIntToScalar(-fCurrOffset.fY)); | |
50 } | |
51 | |
52 bool SkDeviceLooper::computeCurrBitmapAndClip() { | |
53 SkASSERT(kComplex_State == fState); | |
54 | |
55 SkIRect r = SkIRect::MakeXYWH(fCurrOffset.x(), fCurrOffset.y(), | |
56 fDelta, fDelta); | |
57 if (!fBaseBitmap.extractSubset(&fSubsetBitmap, r)) { | |
58 fState = kDone_State; | |
59 return false; | |
60 } | |
61 fSubsetBitmap.lockPixels(); | |
62 | |
63 fBaseRC.translate(-r.left(), -r.top(), &fSubsetRC); | |
64 (void)fSubsetRC.op(SkIRect::MakeWH(fDelta, fDelta), SkRegion::kIntersect_Op)
; | |
65 return true; | |
66 } | |
67 | |
68 bool SkDeviceLooper::next() { | |
69 if (kDone_State == fState) { | |
70 return false; | |
71 } | |
72 | |
73 if (kSimple_State == fState) { | |
74 fCurrBitmap = &fBaseBitmap; | |
75 fCurrRC = &fBaseRC; | |
76 fCurrOffset.set(0, 0); | |
77 fState = kDone_State; | |
78 return true; | |
79 } | |
80 | |
81 SkASSERT(kComplex_State == fState); | |
82 | |
83 // need to propogate fCurrOffset through clippedbounds | |
84 // left to right, until we wrap around and move down | |
85 | |
86 if (fCurrOffset.x() + fDelta < fClippedBounds.right()) { | |
87 fCurrOffset.fX += fDelta; | |
88 return this->computeCurrBitmapAndClip(); | |
89 } | |
90 fCurrOffset.fX = fClippedBounds.left(); | |
91 if (fCurrOffset.y() + fDelta < fClippedBounds.bottom()) { | |
92 fCurrOffset.fY += fDelta; | |
93 return this->computeCurrBitmapAndClip(); | |
94 } | |
95 fState = kDone_State; | |
96 return false; | |
97 } | |
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